Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuinely new behavioral context: the tool returns links to the board's own pages and deliberately hosts no PDFs because of copyright, which sets correct expectations about the return value.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single sentence that front-loads the core fact (official past-paper archive links) and uses a parenthetical for the important caveat about copyright and no hosted PDFs. No wasted words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With three undocumented parameters, no output schema, and no explanation of filtering behavior, the definition leaves too much unspecified for a tool an agent must parameterize. The link-vs-PDF note helps, but the parameter contract is essentially absent.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Three parameters (board, level, subject) have 0% schema description coverage, so the description carries the full burden. It only gestures at 'board' implicitly and says nothing about level or subject, or whether they are free-text filters or how they combine.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly identifies the resource: links to official past-paper archives on the awarding board's own assessment-resources page. It distinguishes the output from a generic search (links, not hosted PDFs) but never contrasts itself with the sibling tools exam_spec_lookup or exam_topic_paper, and 'per spec' is left unexplained.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no when-to-use statement, no prerequisites, and no named alternative. The agent must infer that this is the tool for finding past papers versus exam_spec_lookup or exam_topic_paper; nothing in the text routes it.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.